Things are moving along with the 4000 replica board! The first prototype boards should be ordered before the end of the week if all goes according to plan. Here is a preview of some of the manufacturing data in PFD form. More to come soon!
This is it! This first views of the now completed A4000 Rev B layout! I’m going over it and will soon ask for feedback on this. Please remember this is in Mentor Graphics PADS and requires the viewer from them if you want to see it yourself. It’s free from them. This is amazing work! The pcb database file is located in the layout folder at the Github here: https://github.com/Acill/A4000RevB
I’ve put a lot of time into this and want to thank everyone that donated to make it possible. Very soon now the data to allow new boards to be manufactured will be posted on the Github as well. For those that have access to the full version of Mentor Graphics PADS you could take the info in the Github currently and export it to Gerbers, but I ask that you wait for the final versions to be announced after it’s verified completely. These are the completed project files though now unless errors are discovered.
It seems I have been fixing 1200’s with blown traces a lot these days. In my opinion, this is something that shouldn’t be happening as often as I see it. Remember when you are installing things on the clock ports in this machine that it wasn’t ever intended to be used in the way we are using them. USB devices, fast serial ports, and other things can draw a lot of power. In the case of this one, it was a Subway USB controller that when it was connected wrong and the 12V line from the floppy plugged in caused a short and blew the line. The only way to repair it was by using a jumper. Fortunately its all on the bottom of the board and not seen once installed back into the case.
These are getting hard to come by, but this beauty is now alive and well with a full recap, new IDE header, new floppy power header and some major trace repairs from all the cap leakage.
Saved this A3000 today that had a bad daughter board riser.
Finally got my A3660 together along with the coolest ever 4000 board used for all my repair work and testing. The 3660 is being used to test “new” 68060 processors. How many people can say they own an A4000 board repaired by both me and John Hertell from Sweden?
Replaced some broken rim sockets today in this great looking A3000.